Tablix compute pct chg from previous year quarter

  • Am having a problem in Visual Studio 2008 R2 tablix computing percent change from same quarter last year to this. The expression is in the Qtr detail row, and should be comparing count of FocusArea 2010-Q1 to count of FocusArea 2011-Q1.

    Qtr is set up as a Child Column Group to its parent Year.

    My expression is

    =(COUNT(Fields!FocusArea.Value) - Previous(Count(Fields!FocusArea.Value), "Year"))/Previous(Count(Fields!FocusArea.Value))

    I am getting a percentage but, based on the numbers displayed, it is not correct. I know the percentages showing in year 2010 will not be valid (since there is no 2009), but where did I go wrong with my expression???

    Any help greatly appreciated!! ~Carol

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